Development of accurate radioactivity assessment system for radiation survey with various detectors

Kurihara, Osamu; Kim, E.*; Ueda, Junichi*; Yamada, Yuji*; Kido, Hiroko*; Oguri, Tomomi*; Nemoto, Shintaro*; Nemoto, Makoto*; Akashi, Makoto*

To replay the demand from the sites of radiation emergency medicine, we developed a prototype of a computer system for assessing radioactive contamination accidentally remained in the wound or on the skin surface. This system implements numerical calibration of detectors measuring the contaminant by using a Monte Carlo simulation-based radiation transport code, MCNPX coupled to a numerical phantom modeling the contaminants and the surrounding tissue. By the help of functional graphical user interfaces (GUIs) provided by the system, a user can perform desired simulations without complicated procedures in creating input files for MCNPX. In the present work, benchmark calculations of MCNPX were conducted to verify the simulations, and we optimized detection-related parameters not sufficiently provided by suppliers. The developed system would be useful for better assessments of the radioactive contamination.